Thanks to everyone who has responded!
I've been thinking a lot about my situation. One thing that haunts me is always having another human around me, or having to be responsible at all times for that human. I am a very private person and require a lot of alone time. One thing about me is that I am spontaneous to a fault, having a kid may bring me down on that aspect. At the current moment, I feel that I will be overwhelmed with having to care for another. The thought of waking up every morning to take the kid to school sounds awful, then making sure I'm around or someone is around to pick up the kid, etc.
More thoughts to come...
You might feel a little better if you (a) talked to a therapist, and (b) looked into daycares. I say therapist because some of this definitely sounds like it could use a professional perspective, and some consideration concerning anxiety issues. And daycares, because they have saved my life when I haven't been able to provide day to day care for my kids, because of work or health issues or, frankly, the fact that the daycare gets my kids to the park twice a day, and we all go slowly stir crazy when we're home together all the time.
You talk about your spontanaiety, and how overwhelming it would be to have to wake up every morning and take a kid to school, but... you have dogs. Do they not require any level of daily routine, or care, or planning? (Or, for that matter, cleaning - seriously, you've cleaned up after dogs, trust me when I say that diapers are not worse then that.)
And then there's this unavoidable fact: a child will change your life. A child is an obligation that requires major changes in behavior. That can be frightening. Being a good parent requires you to get past that, some way or other. Some people face it head on and talk it over with pros. Some people sidle past it, doing what needs to be done while giving the parts that upset them minimal consideration. Some people cut deals with their partners to avoid the parts that scare them most.
There is no obligation to become a parent. You don't have to do it. But if you do it, there is an obligation to get over the petty inconveniences and meet your child's needs.